Include dropdown with more options in internal user notifications?

[Tony Tutt]

Hello,
I am setting up a Jira Service for a department and am trying to copy a Service created by a predecessor before me. How do I enable this dropdown menu in Internal notifications to allow administrators and agents to receive notifications from tickets as well? On my current project all I see are the standard 6 options that can be checked.

Thank you!

Additional info - I have also tried setting up a notification scheme, but choosing the option "Project Role" on there does not show the 'agent' role despite it being in the known roles.

[Tony Tutt]

Aditional Info - I have tried to create a Notification Scheme, but when I set one up and pick "Project Role" for recipients, the role of "agent" will still not show up.